Thermodynamic assessment of smectic A-nematic tricritical points through the equal gibbs energy analysis.
A complete thermodynamic analysis on four two-component phase diagrams between liquid crystals belonging to the nCB and nOCB series of compounds, the so-called cyanobiphenyls, has been performed through the Oonk's equal Gibbs energy method. The binary systems dealt with in this paper show as a common feature the existence of a tricritical point at the SmA-to-N phase transition, all of which reported elsewhere. As a singular finding of the work proposed in this paper, the Oonk's method is extended in order to account for second-order phase transitions. Likewise, this extension allows performing calculations of the tricritical temperature.
López
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Laboratori de Caracterització de Materials (LCM-GPFM), Departament de Física i Enginyeria Nuclear, E.T.S.E.I.B Universitat Politècnica de Catalunya, Diagonal, 647, 08028 Barcelona, Spain. david.orencio.lopez@upc.es
Cusmin
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Salud
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Diez-Berart
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de la Fuente
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Pérez-Jubindo
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